Article Search Boosting

An improvement to search in Community 12.0 is Search Boosting. 

The boosting is conservative, treating content (on a logarithmic scale that eventually flattens) > 2 years old ~half as important as recent. This boost is applied *after* the term relevancy score is applied across the results. To access this as an administrator click Pencil Icon > Administration > Site > Search and select the Tuning tab.